A045106 Numbers whose base-4 representation contains exactly four 1's and one 2.

342, 345, 357, 405, 597, 1110, 1113, 1125, 1173, 1302, 1305, 1317, 1350, 1353, 1362, 1368, 1371, 1374, 1377, 1380, 1383, 1389, 1398, 1401, 1413, 1425, 1428, 1431, 1437, 1461, 1494, 1497, 1509, 1557, 1605, 1617, 1620

Offset

1,1

Links

Table of n, a(n) for n=1..37.

Mathematica

Select[Range[2000], DigitCount[#, 4, 1]==4&&DigitCount[#, 4, 2]==1&] (* Harvey P. Dale, Jan 30 2017 *)

Crossrefs

Cf. A007090.

Sequence in context: A239271 A204751 A247441 * A137201 A121205 A038852

Adjacent sequences: A045103 A045104 A045105 * A045107 A045108 A045109

Keyword

nonn,base

Author

Clark Kimberling

Status

approved